“ When national banks begin to provide travel services for their customers, they compete with travel agents no less than they compete with data processors when they provide data-processing services to their customers. ”

“ In Data Processing we did not rely on any legislative history showing that Congress desired to protect data processors alone from competition. [3] Moreover, we noted a growing trend 'toward enlargement of the class of people who may protest administrative action.' 397 U.S., at 154, 90 S.Ct., at 830. We held that § 4 'arguably brings a competitor within the zone of interests protected by it.' Id., at 156, 90 S.Ct., at 831. Nothing in the opinion limited § 4 to protecting only competitors in the data-processing field. ”